320 of the male students are smokers and 480 are non-smokers. 450 of the female students are smokers and 450 are none smokers. What is the probability that a male student and a female student, both chosen randomly, are both smokers?
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The choices of the male and female students are independent of one another, so we can find the probability that both are smoker simply by ...
The probability rules of smokers and non-smokers study is examined.